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<div class="title">hough_transform.hpp</div> </div>
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<div class="contents">
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">// Boost.GIL (Generic Image Library) - tests</span></div>
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<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">//</span></div>
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<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment">// Copyright 2020 Olzhas Zhumabek <anonymous.from.applecity@gmail.com></span></div>
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<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment">//</span></div>
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<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment">// Use, modification and distribution are subject to the Boost Software License,</span></div>
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<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment">// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at</span></div>
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<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment">// http://www.boost.org/LICENSE_1_0.txt)</span></div>
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<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment">//</span></div>
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<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="preprocessor">#ifndef BOOST_GIL_IMAGE_PROCESSING_HOUGH_TRANSFORM_HPP</span></div>
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<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="preprocessor">#define BOOST_GIL_IMAGE_PROCESSING_HOUGH_TRANSFORM_HPP</span></div>
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<div class="line"><a name="l00011"></a><span class="lineno"> 11</span>  </div>
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<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="preprocessor">#include <algorithm></span></div>
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<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="preprocessor">#include <boost/gil/image_processing/hough_parameter.hpp></span></div>
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<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="preprocessor">#include <boost/gil/rasterization/circle.hpp></span></div>
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<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="preprocessor">#include <cmath></span></div>
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<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="preprocessor">#include <cstddef></span></div>
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<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="preprocessor">#include <iterator></span></div>
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<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="preprocessor">#include <vector></span></div>
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<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>  </div>
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<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="keyword">namespace </span>boost { <span class="keyword">namespace </span>gil {</div>
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<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  </div>
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<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="keyword">template</span> <<span class="keyword">typename</span> InputView, <span class="keyword">typename</span> OutputView></div>
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<div class="line"><a name="l00037"></a><span class="lineno"><a class="line" href="group___hough_transform.html#ga2573aec8de0799351116129f7bc6d6a0"> 37</a></span> <span class="keywordtype">void</span> <a class="code" href="group___hough_transform.html#ga2573aec8de0799351116129f7bc6d6a0">hough_line_transform</a>(<span class="keyword">const</span> InputView& input_view, <span class="keyword">const</span> OutputView& accumulator_array,</div>
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<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  <span class="keyword">const</span> <a class="code" href="structboost_1_1gil_1_1hough__parameter.html">hough_parameter<double></a>& theta,</div>
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<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  <span class="keyword">const</span> <a class="code" href="structboost_1_1gil_1_1hough__parameter.html">hough_parameter<std::ptrdiff_t></a>& radius)</div>
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<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> {</div>
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<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  std::ptrdiff_t r_lower_bound = radius.start_point;</div>
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<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  std::ptrdiff_t r_upper_bound = r_lower_bound + radius.step_size * (radius.step_count - 1);</div>
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<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  </div>
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<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  <span class="keywordflow">for</span> (std::ptrdiff_t y = 0; y < input_view.height(); ++y)</div>
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<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  {</div>
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<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  <span class="keywordflow">for</span> (std::ptrdiff_t x = 0; x < input_view.width(); ++x)</div>
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<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  {</div>
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<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  <span class="keywordflow">if</span> (!input_view(x, y)[0])</div>
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<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  {</div>
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<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  <span class="keywordflow">continue</span>;</div>
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<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  }</div>
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<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  </div>
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<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="keywordflow">for</span> (std::size_t theta_index = 0; theta_index < theta.step_count; ++theta_index)</div>
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<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  {</div>
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<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  <span class="keywordtype">double</span> theta_current =</div>
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<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  theta.start_point + theta.step_size * <span class="keyword">static_cast<</span><span class="keywordtype">double</span><span class="keyword">></span>(theta_index);</div>
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<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  std::ptrdiff_t current_r =</div>
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<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  std::llround(<span class="keyword">static_cast<</span><span class="keywordtype">double</span><span class="keyword">></span>(x) * std::cos(theta_current) +</div>
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<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  <span class="keyword">static_cast<</span><span class="keywordtype">double</span><span class="keyword">></span>(y) * std::sin(theta_current));</div>
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<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  <span class="keywordflow">if</span> (current_r < r_lower_bound || current_r > r_upper_bound)</div>
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<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  {</div>
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<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  <span class="keywordflow">continue</span>;</div>
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<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  }</div>
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<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  std::size_t r_index = <span class="keyword">static_cast<</span>std::size_t<span class="keyword">></span>(</div>
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<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  std::llround((current_r - radius.start_point) / radius.step_size));</div>
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<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  <span class="comment">// one more safety guard to not get out of bounds</span></div>
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<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <span class="keywordflow">if</span> (r_index < radius.step_count)</div>
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<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  {</div>
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<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  accumulator_array(theta_index, r_index)[0] += 1;</div>
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<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  }</div>
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<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  }</div>
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<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  }</div>
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<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  }</div>
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<div class="line"><a name="l00074"></a><span class="lineno"> 74</span> }</div>
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<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  </div>
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<div class="line"><a name="l00083"></a><span class="lineno"> 83</span> <span class="keyword">template</span> <<span class="keyword">typename</span> ImageView, <span class="keyword">typename</span> ForwardIterator, <span class="keyword">typename</span> Rasterizer></div>
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<div class="line"><a name="l00084"></a><span class="lineno"><a class="line" href="group___hough_transform.html#ga5b86b273ee7d26cc61f633c24164c70f"> 84</a></span> <span class="keywordtype">void</span> <a class="code" href="group___hough_transform.html#ga5b86b273ee7d26cc61f633c24164c70f">hough_circle_transform_brute</a>(<span class="keyword">const</span> ImageView& input,</div>
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<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  <span class="keyword">const</span> <a class="code" href="structboost_1_1gil_1_1hough__parameter.html">hough_parameter<std::ptrdiff_t></a> radius_parameter,</div>
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<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  <span class="keyword">const</span> <a class="code" href="structboost_1_1gil_1_1hough__parameter.html">hough_parameter<std::ptrdiff_t></a> x_parameter,</div>
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<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  <span class="keyword">const</span> <a class="code" href="structboost_1_1gil_1_1hough__parameter.html">hough_parameter<std::ptrdiff_t></a>& y_parameter,</div>
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<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  ForwardIterator d_first, Rasterizer rasterizer)</div>
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<div class="line"><a name="l00089"></a><span class="lineno"> 89</span> {</div>
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<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  <span class="keywordflow">for</span> (std::size_t radius_index = 0; radius_index < radius_parameter.step_count; ++radius_index)</div>
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<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  {</div>
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<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  <span class="keyword">const</span> <span class="keyword">auto</span> radius = radius_parameter.start_point +</div>
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<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  radius_parameter.step_size * <span class="keyword">static_cast<</span>std::ptrdiff_t<span class="keyword">></span>(radius_index);</div>
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<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  std::vector<point_t> circle_points(rasterizer.point_count(radius));</div>
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<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  rasterizer(radius, {0, 0}, circle_points.begin());</div>
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<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  <span class="comment">// sort by scanline to improve cache coherence for row major images</span></div>
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<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  std::sort(circle_points.begin(), circle_points.end(),</div>
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<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  [](<span class="keyword">const</span> <a class="code" href="classboost_1_1gil_1_1point.html">point_t</a>& lhs, <span class="keyword">const</span> <a class="code" href="classboost_1_1gil_1_1point.html">point_t</a>& rhs) { return lhs.y < rhs.y; });</div>
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<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  <span class="keyword">const</span> <span class="keyword">auto</span> translate = [](std::vector<point_t>& points, <a class="code" href="classboost_1_1gil_1_1point.html">point_t</a> offset) {</div>
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<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  std::transform(points.begin(), points.end(), points.begin(), [offset](<a class="code" href="classboost_1_1gil_1_1point.html">point_t</a> <a class="code" href="classboost_1_1gil_1_1point.html">point</a>) {</div>
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<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  return point_t(point.x + offset.x, point.y + offset.y);</div>
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<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  });</div>
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<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  };</div>
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<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  </div>
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<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  <span class="comment">// in case somebody passes iterator to likes of std::vector<bool></span></div>
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<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  <span class="keyword">typename</span> std::iterator_traits<ForwardIterator>::reference current_image = *d_first;</div>
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<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  </div>
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<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  <span class="comment">// the algorithm has to traverse over parameter space and look at input, instead</span></div>
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<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  <span class="comment">// of vice versa, as otherwise it will call translate too many times, as input</span></div>
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<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  <span class="comment">// is usually bigger than the coordinate portion of parameter space.</span></div>
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<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  <span class="comment">// This might cause extensive cache misses</span></div>
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<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  <span class="keywordflow">for</span> (std::size_t x_index = 0; x_index < x_parameter.step_count; ++x_index)</div>
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<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  {</div>
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<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  <span class="keywordflow">for</span> (std::size_t y_index = 0; y_index < y_parameter.step_count; ++y_index)</div>
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<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  {</div>
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<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  <span class="keyword">const</span> std::ptrdiff_t x = x_parameter.start_point + x_index * x_parameter.step_size;</div>
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<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  <span class="keyword">const</span> std::ptrdiff_t y = y_parameter.start_point + y_index * y_parameter.step_size;</div>
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<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  </div>
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<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  <span class="keyword">auto</span> translated_circle = circle_points;</div>
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<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  translate(translated_circle, {x, y});</div>
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<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  <span class="keywordflow">for</span> (<span class="keyword">const</span> <span class="keyword">auto</span>& <a class="code" href="classboost_1_1gil_1_1point.html">point</a> : translated_circle)</div>
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<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  {</div>
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<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  <span class="keywordflow">if</span> (input(<a class="code" href="classboost_1_1gil_1_1point.html">point</a>))</div>
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<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  {</div>
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<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  ++current_image(x_index, y_index)[0];</div>
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<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  }</div>
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<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  }</div>
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<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  }</div>
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<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  }</div>
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<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  ++d_first;</div>
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<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  }</div>
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<div class="line"><a name="l00132"></a><span class="lineno"> 132</span> }</div>
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<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  </div>
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<div class="line"><a name="l00134"></a><span class="lineno"> 134</span> }} <span class="comment">// namespace boost::gil</span></div>
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<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  </div>
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<div class="line"><a name="l00136"></a><span class="lineno"> 136</span> <span class="preprocessor">#endif</span></div>
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</div><!-- fragment --></div><!-- contents -->
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<div class="ttc" id="astructboost_1_1gil_1_1hough__parameter_html"><div class="ttname"><a href="structboost_1_1gil_1_1hough__parameter.html">boost::gil::hough_parameter</a></div><div class="ttdoc">A type to encapsulate Hough transform parameter range.</div><div class="ttdef"><b>Definition:</b> hough_parameter.hpp:26</div></div>
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<div class="ttc" id="agroup___hough_transform_html_ga2573aec8de0799351116129f7bc6d6a0"><div class="ttname"><a href="group___hough_transform.html#ga2573aec8de0799351116129f7bc6d6a0">boost::gil::hough_line_transform</a></div><div class="ttdeci">void hough_line_transform(const InputView &input_view, const OutputView &accumulator_array, const hough_parameter< double > &theta, const hough_parameter< std::ptrdiff_t > &radius)</div><div class="ttdoc">Vote for best fit of a line in parameter space.</div><div class="ttdef"><b>Definition:</b> hough_transform.hpp:37</div></div>
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<div class="ttc" id="aclassboost_1_1gil_1_1point_html"><div class="ttname"><a href="classboost_1_1gil_1_1point.html">boost::gil::point< std::ptrdiff_t ></a></div></div>
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<div class="ttc" id="agroup___hough_transform_html_ga5b86b273ee7d26cc61f633c24164c70f"><div class="ttname"><a href="group___hough_transform.html#ga5b86b273ee7d26cc61f633c24164c70f">boost::gil::hough_circle_transform_brute</a></div><div class="ttdeci">void hough_circle_transform_brute(const ImageView &input, const hough_parameter< std::ptrdiff_t > radius_parameter, const hough_parameter< std::ptrdiff_t > x_parameter, const hough_parameter< std::ptrdiff_t > &y_parameter, ForwardIterator d_first, Rasterizer rasterizer)</div><div class="ttdoc">Vote for best fit of a circle in parameter space according to rasterizer.</div><div class="ttdef"><b>Definition:</b> hough_transform.hpp:84</div></div>
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